Children with blisters in the mouth may be caused by a lack of trace elements, or due to infection, such as oral ulcers, herpes pharyngitis, it is recommended to promptly consult a doctor to clarify the cause of the disease and then carry out targeted treatment. Common causes and treatments 1, lack of trace elements: lack of zinc as well as vitamin B in children can lead to small herpes, prone to recurring episodes, it is recommended to take zinc gluconate tablets, zinc sulfate syrup, while supplementing multivitamins, such as vitamin B, vitamin C, can promote ulcer healing; 2, oral ulcers: mostly caused by burns, bites, eating irritating food or bacterial, viral infections cause inflammation reaction, resulting in ulcers inside the mouth, which develop into small herpes. Oral ulcers are self-limiting and can be self-absorbing, or you can use oral ulcer patches on the affected area, and anti-infective treatment can be prescribed when symptoms are severe; 3. Herpes pharyngitis: mostly caused by coxsackie group A virus infection, manifested as grayish-white herpes, which is highly contagious. The main treatment is generally symptomatic, such as fever, oral ibuprofen, such as sore throat, lidocaine aerosol, such as secondary bacterial infection, cephalosporin antibiotics can be used for treatment as prescribed. Note 1, pay attention to a balanced diet, appropriate supplementation of trace elements, eat more vegetables, fruits, yogurt; 2, pay attention to rest, to ensure adequate sleep quality, enhance the body resistance.